WO2010073985A1 - Film optique et dispositif d'affichage à cristaux liquides le comprenant - Google Patents

Film optique et dispositif d'affichage à cristaux liquides le comprenant Download PDF

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Publication number
WO2010073985A1
WO2010073985A1 PCT/JP2009/071127 JP2009071127W WO2010073985A1 WO 2010073985 A1 WO2010073985 A1 WO 2010073985A1 JP 2009071127 W JP2009071127 W JP 2009071127W WO 2010073985 A1 WO2010073985 A1 WO 2010073985A1
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WIPO (PCT)
Prior art keywords
liquid crystal
light
optical film
resin
film
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PCT/JP2009/071127
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English (en)
Japanese (ja)
Inventor
基裕 山原
康弘 羽場
知典 宮本
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住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to US13/141,273 priority Critical patent/US20110279752A1/en
Priority to CN200980152242XA priority patent/CN102265193A/zh
Publication of WO2010073985A1 publication Critical patent/WO2010073985A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements

Definitions

  • the present invention relates to an optical film and a liquid crystal display device including the same.
  • an antiglare film conventionally, a resin in which resin beads are mixed and dispersed is coated on a transparent base film and irregularities are formed on the surface (Patent Document 1).
  • Patent Document 1 a resin in which resin beads are mixed and dispersed is coated on a transparent base film and irregularities are formed on the surface.
  • the liquid crystal display device is required to have an optical film that is less likely to cause display quality problems at a wide viewing angle, has high front contrast and high transparency of transmitted images, and can hardly cause scintillation. Yes.
  • the optical film of the present invention that achieves the above object is an optical film having a base film and an antiglare layer in which translucent fine particles are dispersed and mixed in a translucent resin,
  • the average particle size is 0.5 ⁇ m or more and less than 5 ⁇ m, and the content of the translucent fine particles is 35 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the translucent resin, and the antiglare layer
  • the layer thickness is 1 to 3 times the average particle size of the light-transmitting fine particles.
  • the average particle diameter of translucent fine particle is a diameter in 50 weight% of the particle size distribution using the Coulter principle (pore electrical resistance method), and is a Coulter multisizer (made by Beckman Coulter). I can find it.
  • the refractive index of the translucent fine particles is preferably larger than the refractive index of the translucent resin, and the difference between the refractive index of the translucent fine particles and the refractive index of the translucent resin is 0. It is preferably 0.04 or more and 0.1 or less.
  • the liquid crystal display device of the present invention includes a backlight device, a light deflecting unit, a first polarizing plate, a liquid crystal cell in which a liquid crystal layer is provided between a pair of substrates, a second polarizing plate, and an optical film.
  • the first polarizing plate and the second polarizing plate are liquid crystal display devices arranged so that their transmission axes are in a crossed Nicols relationship, Any one of those described above is used.
  • a linear prism having a polygonal cross section and an apex angle of 90 to 110 ° at the leading edge is provided at a predetermined interval on the light emitting surface side.
  • the direction of the ridge line of the linear prism is substantially parallel to the transmission axis of the first polarizing plate, and the other prism film is
  • the ridgeline direction of the linear prism is preferably arranged so as to be substantially parallel to the transmission axis of the second polarizing plate.
  • substantially parallel includes the case of being completely parallel and the case of being deviated from parallel in an angle range of about ⁇ 5 °.
  • liquid crystal display device including the optical film of the present invention, it is difficult for display quality problems to occur in a wide viewing angle, high front contrast and high transmitted image definition are obtained, and scintillation is also difficult to occur.
  • FIG. 1 is a schematic diagram showing an embodiment of an optical film according to the present invention.
  • the optical film 7 in FIG. 1 is formed by laminating an antiglare layer 72 in which translucent fine particles 722 are dispersed and mixed in a translucent resin 721 on one surface side of a base film 71.
  • the translucent fine particles 722 used here have an average particle size of 0.5 ⁇ m or more and less than 5 ⁇ m, and the blending amount in the translucent resin 721 is 35 parts by weight or more with respect to 100 parts by weight of the translucent resin. It is important that it is 60 parts by weight or less.
  • the more preferable average particle diameter of the light-transmitting fine particles 722 is 2 to 5 ⁇ m, and the more preferable blending amount is 40 to 50 parts by weight.
  • the translucent fine particles 722 used in the present invention are not particularly limited as long as they have the above average particle diameter and translucency, and conventionally known ones can be used.
  • organic fine particles such as acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin, acrylic-styrene copolymer, and inorganic fine particles such as calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, and glass These may be used, and one or more of these may be used in combination.
  • Organic polymer balloons and glass hollow beads can also be used.
  • the shape of the translucent fine particles may be any of a spherical shape, a flat shape, a plate shape, a needle shape, etc., but a spherical shape is particularly desirable.
  • the refractive index of the translucent fine particles 722 is preferably larger than the refractive index of the translucent resin 721, and the difference is preferably in the range of 0.04 to 0.1.
  • the difference in refractive index between the light-transmitting fine particles 722 and the light-transmitting resin 721 within the above range, not only the surface scattering due to the unevenness of the surface of the anti-glare layer with respect to the light incident on the anti-glare layer 72, Internal scattering due to a difference in refractive index between the translucent fine particles 722 and the translucent resin 721 can be expressed, and the occurrence of scintillation can be suppressed. It is preferable that the difference in refractive index is 0.1 or less because the optical film 7 tends to suppress whitening.
  • the translucent resin 721 used in the present invention is not particularly limited as long as it has translucency.
  • ionizing radiation curable resins such as ultraviolet curable resins and electron beam curable resins, and thermosetting types. Resins, thermoplastic resins, metal alkoxides, and the like can be used. Among these, ionizing radiation curable resins are preferable from the viewpoint of having high hardness and imparting sufficient scratch resistance to the optical film provided on the display surface.
  • polyfunctional acrylates such as polyhydric alcohol acrylic acid or methacrylic acid ester, polyfunctional acrylate synthesized from diisocyanate and polyhydric alcohol and acrylic acid or methacrylic acid hydroxy ester, etc. And urethane acrylate.
  • polyether resins having an acrylate functional group polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be used.
  • a photopolymerization initiator when an ultraviolet curable resin is used, a photopolymerization initiator is added. Although what kind of thing may be used for a photoinitiator, it is preferable to use what was suitable for resin to be used.
  • the photopolymerization initiator radiation polymerization initiator
  • benzoin such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl methyl ketal, and alkyl ethers thereof are used.
  • the amount of photosensitizer used is 0.5 to 20 wt% with respect to the resin. Preferably, it is 1 to 5 wt%.
  • thermosetting resin examples include thermosetting urethane resin composed of acrylic polyol and isocyanate prepolymer, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, silicone resin and the like.
  • thermoplastic resin examples include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose, vinyl acetate and copolymers thereof, vinyl chloride and copolymers thereof, vinylidene chloride and copolymers thereof, and the like.
  • Acetal resin such as acryl resin, polyvinyl formal, polyvinyl butyral, acrylic resin and its copolymer, acrylic resin such as methacryl resin and its copolymer, polystyrene resin, polyamide resin, linear polyester resin, polycarbonate resin, etc. are used it can.
  • a silicon oxide matrix made of a silicon alkoxide material can be used.
  • tetramethoxysilane and tetraethoxysilane can be exemplified, and an inorganic or organic-inorganic composite matrix can be obtained by hydrolysis and dehydration condensation.
  • the translucent resin 721 When an ionizing radiation curable resin is used as the translucent resin 721, it is necessary to irradiate ionizing radiation such as ultraviolet rays and electron beams after being applied to the base film 71 and dried. In the case where a thermosetting resin or a metal alkoxide is used as the translucent resin 721, heating may be required after coating and drying.
  • ionizing radiation curable resin such as ultraviolet rays and electron beams
  • the “layer thickness of the antiglare layer” refers to the maximum thickness from the surface of the antiglare layer that contacts the base film to the opposite surface. Therefore, when the antiglare layer has irregularities in the optical film of the present invention, the thickest portion corresponding to A shown in FIG. 1 is the layer thickness of the antiglare layer. It is important that the layer thickness A of the antiglare layer 72 is not less than 1 and not more than 3 times the average particle diameter of the translucent fine particles 722. When the layer thickness A of the antiglare layer 72 is less than 1 times the average particle diameter of the translucent fine particles 722, the resulting optical film 7 has a rough texture and scintillation is likely to occur, so that the display surface is highly visible. descend.
  • the layer thickness A of the antiglare layer 72 exceeds 3 times the average particle diameter of the light transmitting fine particles 722, it becomes difficult to form irregularities on the surface of the antiglare layer 72.
  • the layer thickness A of the antiglare layer 72 is usually preferably in the range of 5 to 25 ⁇ m. If the layer thickness A of the antiglare layer 72 is less than 5 ⁇ m, sufficient scratch resistance sufficient to be provided on the display surface may not be obtained. On the other hand, if the layer thickness A of the antiglare layer 72 exceeds 25 ⁇ m, The degree of curling of the produced optical film 7 may increase, and the handleability may deteriorate.
  • the thickness of the antiglare layer is the average particle size of the light-transmitting fine particles It may not be 1 time or more with respect to the diameter.
  • the base film 71 used in the present invention may be a translucent film such as glass or plastic film.
  • the plastic film only needs to have appropriate transparency and mechanical strength. Examples thereof include cellulose acetate resins such as TAC (triacetyl cellulose), acrylic resins, polycarbonate resins, polyester resins such as polyethylene terephthalate, and the like.
  • the optical film 7 of the present invention can be produced, for example, as follows.
  • the resin solution in which the light-transmitting fine particles 722 are dispersed is applied onto the base film 71, and the coating film thickness is adjusted so that the light-transmitting fine particles 722 appear on the surface of the coating film. Form on the surface.
  • the dispersion of the light-transmitting fine particles 722 is preferably isotropic dispersion.
  • the base film 71 may be subjected to a surface treatment before application of the resin solution in order to improve coatability and adhesion with the antiglare layer.
  • a surface treatment include corona discharge treatment, glow discharge treatment, acid treatment, alkali treatment, and ultraviolet irradiation treatment.
  • the base film 71 and the polarizer 61 are effectively bonded.
  • the base film 71 is preferably hydrophilized by acid treatment or alkali treatment.
  • the method for applying the resin solution on the base film 71 there is no limitation on the method for applying the resin solution on the base film 71.
  • the gravure coating method, the micro gravure coating method, the roll coating method, the rod coating method, the knife coating method, the air knife coating method, the kiss coating method, and the die coating method. Etc. can be used.
  • the ionizing radiation species in the present invention is not particularly limited, and may be appropriately selected from ultraviolet rays, electron beams, near ultraviolet rays, visible light, near infrared rays, infrared rays, X-rays, and the like according to the type of translucent resin 721.
  • ultraviolet rays and electron beams are preferred, and ultraviolet rays are particularly preferred because they are easy to handle and high energy can be easily obtained.
  • any light source that generates ultraviolet light can be used.
  • a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • An ArF excimer laser, a KrF excimer laser, an excimer lamp, synchrotron radiation, or the like can also be used.
  • an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, and a metal halide lamp can be preferably used.
  • an electron beam can be used similarly as ionizing radiation for curing the coating film.
  • the electron beam 50 to 1000 keV, preferably 100 to 100, emitted from various electron beam accelerators such as cockroft Walton type, bandegraph type, resonant transformer type, insulated core transformer type, linear type, dynamitron type, high frequency type, etc.
  • An electron beam having an energy of 300 keV can be given.
  • the process of continuously feeding the substrate film 71 wound in a roll shape, the process of applying and drying the resin solution, and curing the coating film And a step of winding up the optical film 7 on which the hardened antiglare layer 72 is formed are necessary.
  • FIG. 2 shows another embodiment of the optical film of the present invention.
  • the optical film 7a shown in FIG. 6A is formed by laminating an antiglare layer 72 in which translucent fine particles 722 are dispersed and mixed in a translucent resin 721 on one surface side of a base film 71.
  • fine irregularities are formed by sandblasting or the like.
  • a method of forming fine irregularities in the manufacturing process of the antiglare layer 72 may be used.
  • the optical film 7b shown in FIG. 6B includes a light-transmitting resin layer 73 having fine irregularities formed on the surface of an anti-glare layer 72 in which light-transmitting fine particles 722 are dispersed and mixed in the light-transmitting resin 721. Laminated.
  • the layer thickness A of the antiglare layer is the maximum thickness from the surface of the antiglare layer that contacts the base film to the surface on which the opposite unevenness is formed.
  • the layer thickness A of the antiglare layer is the maximum thickness from the surface of the antiglare layer that contacts the base film to the surface that contacts the opposite translucent resin layer 73.
  • the polarizing plate usually has a structure in which support films 62 are bonded to both surfaces of the polarizer 61.
  • a laminated film 70 shown in FIG. 3 uses the optical film 7 as one support film of the polarizer 61 of the polarizing plate, and is a multifunctional film having a polarizing function and an antiglare function. That is, the support film 62 is attached to one surface of the polarizer 61, and the optical film 7 in which the antiglare layer 72 having fine irregularities formed on the surface is formed on the base film 71 is attached to the other surface.
  • the support film 62 is attached to one surface of the polarizer 61
  • the optical film 7 in which the antiglare layer 72 having fine irregularities formed on the surface is formed on the base film 71 is attached to the other surface.
  • the optical film 7 is attached to a glass substrate or the like of the liquid crystal display panel so that the optical film 7 is on the light emitting side.
  • the support film 71 and the polarizer 61 may be bonded together via an adhesive layer, but it is preferable to directly bond them without using an adhesive layer.
  • FIG. 4 is a schematic diagram showing an example of the liquid crystal display device 100 according to the present invention.
  • the liquid crystal display device of FIG. 4 is a normally white mode TN liquid crystal display device, which includes a backlight device 2, a light diffusion plate 3, two prism films 4a and 4b as light deflecting means, A liquid crystal cell 1 in which a liquid crystal layer 12 is provided between one polarizing plate 5 and a pair of transparent substrates 11a and 11b, a second polarizing plate 6, and an optical film 7 are arranged in this order.
  • the perpendicular to the light exit surface of the light diffusing plate 3 is substantially parallel to the Z axis.
  • the perpendicular line of the light exit surface (opening) of the backlight 2 is substantially parallel to the Z axis. Moreover, the perpendicular line of the light incident surface of the prism films 4a and 4b is substantially parallel to the Z axis.
  • the first polarizing plate 5 and the second polarizing plate 6 are arranged so that their transmission axes (Y direction, X direction) are in a crossed Nicols relationship.
  • Each of the two prism films 4a and 4b has a flat surface on the light incident surface side, and a plurality of linear prisms having a triangular cross section on the light emitting surface side.
  • the prism film 4 a is arranged such that the ridge line of the linear prism is substantially parallel to the transmission axis direction of the first polarizing plate 5, and the prism film 4 b has the ridge line of the linear prism transmitted through the second polarizing plate 6. It arrange
  • the apex angle ⁇ of the linear prism having a triangular cross section is in the range of 90 ° to 110 °.
  • the isosceles triangle and the unequal sides are arbitrary in the triangular shape of the cross section, but when concentrating in the front direction, an isosceles triangle is preferable, and adjacent isosceles triangles are sequentially arranged adjacent to the base opposite to the apex angle. It is preferable to have a structure in which the ridge lines that are the rows of corners are arranged so that the major axes are substantially parallel to each other. In this case, the apex angle and the base angle may have curvature unless the light collecting ability is significantly reduced.
  • the distance between the ridge lines is usually in the range of 10 ⁇ m to 500 ⁇ m, and preferably in the range of 30 ⁇ m to 200 ⁇ m.
  • the ridgeline of the linear prism may be linear or wave-curved.
  • the direction of the ridge line when the ridge line is a wavy curve as viewed from the light exit surface side refers to the direction of the regression line obtained by the least square method.
  • the transmission axis direction of the first polarizing plate 5 and the transmission axis direction of the second polarizing plate 6 may be installed in parallel.
  • the light emitted from the backlight device 2 is diffused by the light diffusion plate 3 and then enters the prism film 4a.
  • a vertical cross section (ZX plane) orthogonal to the transmission axis direction of the first polarizing plate 5 light incident obliquely with respect to the lower surface of the prism film 4a is emitted with its path changed in the front direction.
  • the prism film 4b in the vertical cross section (ZY plane) orthogonal to the transmission axis direction of the second polarizing plate 6, light incident obliquely to the lower surface of the prism film 4b is in the front direction as described above. The route is changed to and exits.
  • the light that has passed through the two prism films 4a and 4b is condensed in the front direction (Z direction) in any vertical section, and the luminance in the front direction is improved.
  • the direction is parallel to a direction that forms an angle of about 45 ° with respect to the transmission axis 5a of the first polarizing plate 5 and the transmission axis 6a of the second polarizing plate 6.
  • the angle ⁇ formed with the direction greatly inclined with respect to the front direction (Z direction) for example, the front direction (Z direction) is +35 to + 60 °, ⁇ 35 to The luminance in the direction of the range of ⁇ 60 ° decreases.
  • black float in a direction of approximately 45 ° from the transmission axis of the polarizing plate is reduced.
  • black floating means a phenomenon that becomes whitish when black is displayed.
  • the light imparted with directivity in the front direction is changed from circularly polarized light to linearly polarized light by the first polarizing plate 5 and enters the liquid crystal cell 1.
  • the light incident on the liquid crystal cell 1 is emitted from the liquid crystal cell 1 with its polarization plane controlled for each pixel by the orientation of the liquid crystal layer 12 controlled by the electric field.
  • the light emitted from the liquid crystal cell 1 is imaged by the second polarizing plate 6, passes through the optical film 7, and exits to the display surface side.
  • the directivity of the light incident on the liquid crystal cell 1 in the front direction is higher than before due to the two prism films 4a and 4b.
  • the luminance in the front direction is improved as compared with the conventional device, and the liquid crystal display device 100 has reduced black floating in the 45 ° direction from the transmission axis of the polarizing plate.
  • the optical film 7 described above is used, it is difficult to cause a display quality defect at a wide viewing angle without deteriorating the front contrast, and a high transmission image sharpness is obtained, and further, scintillation is hardly caused. Become.
  • a liquid crystal is sealed between a pair of transparent substrates 11a and 11b arranged to face each other at a predetermined distance by a spacer (not shown), and the pair of transparent substrates 11a and 11b.
  • the liquid crystal layer 12 is provided.
  • a transparent electrode and an alignment film are laminated on each of the pair of transparent substrates 11a and 11b, and the liquid crystal is formed by applying a voltage based on display data between the transparent electrodes.
  • the display method of the liquid crystal cell 1 is the TN method, but a display method such as an IPS method or a VA method may be adopted.
  • the backlight device 2 includes a rectangular parallelepiped case 21 having an upper surface opening, and a plurality of cold cathode tubes 22 serving as linear light sources arranged in parallel in the case 21.
  • the case 21 is formed from a resin material or a metal material, and it is desirable that at least the case inner peripheral surface is white or silver from the viewpoint of reflecting the light emitted from the cold cathode tube 22 on the case inner peripheral surface.
  • a light source in addition to a cold cathode tube, a hot cathode tube, a linearly arranged LED, and the like can be used.
  • the number of the linear light sources to be arranged is not particularly limited, but the distance between the centers of adjacent linear light sources is in the range of 15 to 150 mm from the viewpoint of suppressing luminance unevenness on the light emitting surface. It is preferable to do so.
  • the backlight device 2 used in the present invention is not limited to the direct type shown in FIG. 4, but is a side-ride type in which a linear light source or a point light source is arranged on the side surface of the light guide plate, or a light source.
  • a conventionally well-known thing, such as a planar light source type itself, can be used.
  • the light diffusing plate 3 includes a base material in which a diffusing agent is dispersed and mixed.
  • the base material includes polycarbonate, methacrylic resin, methyl methacrylate-styrene copolymer resin, acrylonitrile-styrene copolymer resin, methacrylic acid- Styrene copolymer resins, polyolefins such as polystyrene, polyvinyl chloride, polypropylene, polymethylpentene, cyclic polyolefins, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide resins, polyarylate, polyimide, etc. Can be used.
  • the diffusing agent mixed and dispersed in the base material is fine particles made of a material having a refractive index different from that of the base material, and specific examples include acrylic resins and melamine resins of a different type from the base material.
  • Organic fine particles such as polyethylene, polystyrene, organic silicone resin, acrylic-styrene copolymer, and inorganic fine particles such as calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, and glass. One or more of them are mixed and used.
  • Organic polymer balloons and glass hollow beads can also be used as the diffusing agent.
  • the average particle diameter of the diffusing agent is preferably in the range of 0.5 ⁇ m to 30 ⁇ m.
  • the shape of the diffusing agent may be not only spherical but also flat, plate-like, and needle-like.
  • the liquid crystal display device of the present invention may not include light diffusing means such as the light diffusing plate 3, but preferably includes light diffusing means.
  • the light incident surface side is a flat surface, and a plurality of linear prisms having a triangular cross section are formed in parallel on the light output surface side.
  • the material of the prism films 4a and 4b include polycarbonate resin, ABS resin, methacrylic resin, methyl methacrylate-styrene copolymer resin, polystyrene resin, acrylonitrile-styrene copolymer resin, and polyolefin resin such as polyethylene / polypropylene. Is mentioned.
  • an ordinary thermoplastic resin molding method can be used.
  • the prism film may be produced by hot press molding using a mold.
  • a diffusing agent may be dispersed in the prism films 4a and 4b.
  • the thickness of the prism films 4a and 4b is usually 0.1 to 15 mm, preferably 0.5 to 10 mm.
  • the light diffusing plate 3 and the prism films 4a and 4b may be integrally formed, or may be joined after being independently produced.
  • An air layer may be provided between the light diffusion plate 3 and the prism films 4a and 4b.
  • a dichroic dye or iodine is adsorbed and oriented on a polarizer substrate such as a polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide resin, or polyester resin.
  • a polyvinyl alcohol / polyvinylene copolymer containing a molecular chain oriented with a dichroic dehydrated product of polyvinyl alcohol (polyvinylene) in a molecularly oriented polyvinyl alcohol film is a polarizer substrate.
  • a polarizer substrate made of polyvinyl alcohol resin obtained by adsorbing and orienting a dichroic dye or iodine is preferably used as the polarizer.
  • the thickness of the polarizer is not particularly limited, but in general, it is preferably 100 ⁇ m or less, more preferably in the range of 10 to 50 ⁇ m, still more preferably in the range of 25 to 35 ⁇ m for the purpose of reducing the thickness of the polarizing plate.
  • a film made of a polymer having low birefringence and excellent in transparency, mechanical strength, thermal stability, moisture shielding property and the like is preferable.
  • films include cellulose acetate resins such as TAC (triacetyl cellulose), acrylic resins, fluorine resins such as tetrafluoroethylene / hexafluoropropylene copolymers, polycarbonate resins, and polyethylene.
  • Polyester resin such as terephthalate, polyimide resin, polysulfone resin, polyethersulfone resin, polystyrene resin, polyvinyl alcohol resin, polyvinyl chloride resin, polyolefin resin or polyamide resin, etc.
  • a triacetyl cellulose film or a norbornene-based thermoplastic resin film whose surface is saponified with an alkali or the like can be preferably used from the viewpoints of polarization characteristics and durability.
  • the norbornene-based thermoplastic resin film is particularly suitable because the film is a good barrier from heat and wet heat, so the durability of the polarizing plate is greatly improved and the dimensional stability is greatly improved due to its low moisture absorption rate.
  • a conventionally known method such as a casting method, a calendar method, or an extrusion method can be used.
  • the thickness of the support film is not limited, it is usually preferably 500 ⁇ m or less, more preferably in the range of 5 to 300 ⁇ m, still more preferably in the range of 5 to 150 ⁇ m, from the viewpoint of thinning the polarizing plate.
  • FIG. 6 shows another embodiment of the liquid crystal display device 100 of the present invention.
  • the liquid crystal display device 100 of FIG. 6 is different from the liquid crystal display device 100 of FIG. 4 in that a retardation plate 8 is disposed between the first polarizing plate 5 and the liquid crystal cell 1.
  • This phase difference plate 8 has a substantially zero phase difference in a direction perpendicular to the surface of the liquid crystal cell 1, has no optical effect from the front, and has a phase difference when viewed from an oblique direction. It is intended to compensate for the phase difference that occurs and occurs in the liquid crystal cell 1. This makes it possible to obtain better display quality and color reproducibility over a wider viewing angle.
  • the retardation plate 8 can be disposed between the first polarizing plate 5 and the liquid crystal cell 1 and at one or both between the second light diffusion layer 6 and the liquid crystal cell 1.
  • phase difference plate 8 for example, a polycarbonate resin or a cyclic olefin polymer resin is used as a film and the film is further biaxially stretched, or a liquid crystal monomer is fixed in a molecular arrangement by a photopolymerization reaction. Can be mentioned. Since the phase difference plate 8 optically compensates the alignment of the liquid crystal, the retardation plate 8 having a refractive index characteristic opposite to that of the liquid crystal alignment is used.
  • a TN mode liquid crystal display cell for example, “WV film” (manufactured by Fuji Film)
  • STN mode liquid crystal display cell for example, “LC film” (manufactured by Nippon Oil Corporation)
  • IPS mode for example, for a liquid crystal cell, a biaxial retardation film is used.
  • VA mode liquid crystal cell for example, a retardation plate combining a A plate and a C-plate, a biaxial retardation film, a ⁇ cell mode liquid crystal cell
  • OCB WV film manufactured by Fuji Film Co., Ltd.
  • Optical Film Production Example 1 (1) Production of Embossing Die A surface of a 200 mm diameter iron roll (STKM13A according to JIS) with copper ballad plating was prepared. Copper ballad plating consists of a copper plating layer / thin silver plating layer / surface copper plating layer, and the thickness of the entire plating layer was about 200 ⁇ m. The copper-plated surface is mirror-polished, and on the polished surface, a blasting device (manufactured by Fuji Seisakusho) is used, and zirconia beads TZ-B125 (manufactured by Tosoh Corp., average particle diameter) are used as the first fine particles.
  • a blasting device manufactured by Fuji Seisakusho
  • zirconia beads TZ-B125 manufactured by Tosoh Corp., average particle diameter
  • 125 ⁇ m was blasted at a blast pressure of 0.05 MPa (gauge pressure, the same applies hereinafter) and a fine particle usage of 16 g / cm 2 (a used amount per 1 cm 2 of surface area of the roll, the same applies hereinafter) to form irregularities on the surface.
  • a blasting device manufactured by Fuji Seisakusho
  • zirconia beads TZ-SX-17 manufactured by Tosoh Corp., average particle size: 20 ⁇ m
  • the surface unevenness was finely adjusted by blasting at 1 MPa and a fine particle usage amount of 4 g / cm 2 .
  • the resulting copper-plated iron roll with unevenness was etched with a cupric chloride solution.
  • the etching amount at that time was set to 3 ⁇ m.
  • chromium plating was performed to produce a mold.
  • the chromium plating thickness was set to 4 ⁇ m.
  • the Vickers hardness of the chromium plating surface of the obtained mold was 1000.
  • the Vickers hardness was measured according to JIS Z 2244 using an ultrasonic hardness tester MIC10 (manufactured by Krautkramer) (the measurement method for Vickers hardness is the same in the following examples).
  • a coating solution was prepared by dilution with This coating solution was coated on a 80 ⁇ m thick triacetyl cellulose (TAC) film (base film) and dried for 1 minute in a dryer set at 80 ° C.
  • TAC triacetyl cellulose
  • the base film after drying was brought into close contact with the uneven surface of the mold prepared in (1) above by pressing with a rubber roll so that the ultraviolet curable resin composition layer was on the mold side.
  • the ultraviolet curable resin composition layer is cured by irradiating light from a high-pressure mercury lamp with an intensity of 20 mW / cm 2 so as to be 300 mJ / cm 2 in terms of the amount of h-ray converted from the base film side.
  • Production Example 2 of optical film In Production Example 1 of the optical film, instead of 40 parts by mass of polystyrene particles having an average particle diameter of 2.0 ⁇ m (manufactured by Sekisui Plastics Co., Ltd.), polystyrene particles having an average particle diameter of 3.0 ⁇ m (Soken Chemical) An optical film was produced in the same manner as in Production Example 1 of the optical film except that 40 parts by mass was used, and the haze value was measured. The results are shown in Table 1.
  • Production Example 3 of Optical Film In Production Example 1 of the optical film, instead of 40 parts by mass of polystyrene particles having an average particle size of 2.0 ⁇ m (manufactured by Sekisui Plastics Co., Ltd.), polystyrene particles having an average particle size of 4.0 ⁇ m (sekisui) An optical film was produced in the same manner as in Production Example 1 of the optical film except that 40 parts by mass (manufactured by Seikoku Kogyo Co., Ltd.) was used, and its haze value was measured. The results are shown in Table 1.
  • Production Example 6 of optical film In Production Example 1 of the optical film, instead of 40 parts by mass of polystyrene particles having an average particle size of 2.0 ⁇ m (manufactured by Sekisui Plastics Co., Ltd.), polystyrene particles having an average particle size of 4.0 ⁇ m (sekisui) An optical film was produced in the same manner as in Production Example 1 of the optical film, except that 30 parts by mass (manufactured by Seikoku Kogyo Co., Ltd.) was used, and its haze value was measured. The results are shown in Table 1.
  • the optical films of Production Examples 1 to 8 were evaluated for transmitted image definition as follows. Using an optically transparent adhesive, a base film of an optical film was bonded to a glass substrate to prepare a measurement sample. By bonding, it is possible to prevent warping of the film at the time of measurement and improve measurement reproducibility.
  • an image clarity measuring device manufactured by Suga Test Instruments Co., Ltd.
  • ICM-1DP based on JIS K 7105 was used.
  • the ratio of the width of the dark portion to the bright portion is 1: 1, and the width is obtained through optical combs of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm.
  • the sum of transmitted image sharpness was calculated.
  • the maximum value of the transmitted image definition is 400%. If the transmitted image definition was 70% or more, the transmitted image definition was good, and it was marked as ⁇ . If it was less than 70%, the transmitted image definition was poor, and it was set as x. The results are shown in Table 2.
  • the transmitted image definition evaluates the degree of blurring of the video.
  • the optical films of the present invention (Production Examples 1 to 5) and the optical films of Production Examples 6 and 8 had good transmission image definition. In the optical film of Production Example 7, the transmitted image definition was low.
  • UV absorber SUMISOB 200” manufactured by Sumitomo Chemical Co., Ltd.
  • IRGANOX 1010 antioxidant manufactured by Ciba Specialty Chemicals Co., Ltd.
  • crosslinked siloxane-based resin particles (“Trefill DY33-719” manufactured by Toray Dow Corning Silicone Co., Ltd., refractive index of 1.42, Together with a weight average particle diameter of 2 ⁇ m), the mixture was melt kneaded by a first extruder and supplied to a feed block.
  • the addition amount of the crosslinked siloxane-based resin particles the total light transmittance Tt of the diffusion plate was adjusted, and a light diffusion plate having a total light transmittance Tt of 65% was produced.
  • the resin supplied from the first extruder to the feed block becomes an intermediate layer (base layer), and the resin supplied from the second extruder to the feed block becomes a surface layer (both sides).
  • the laminate is made of three layers having a thickness of 2 mm (intermediate layer 1.90 mm, surface layer 0.05 mm ⁇ 2).
  • the total light transmittance Tt was measured using a haze transmittance meter (HR-100, manufactured by Murakami Color Research Laboratory) in accordance with JIS K 7361.
  • a styrene resin (refractive index: 1.59) was press-molded into a mold having a mirror-finished surface to produce a flat plate having a thickness of 1 mm.
  • Ra center line average roughness
  • Rz ten-point average height
  • the styrene resin plate is re-press-molded using a metal mold in which V-shaped linear grooves having a cross section of an apex angle ⁇ and a distance between ridge lines of an isosceles triangle of 50 ⁇ m are arranged in parallel.
  • a prism film was produced.
  • prism films having apex angles ⁇ of 90 °, 95 °, and 110 ° were produced, and used in Examples and Reference Examples described later together with the produced light diffusion plate.
  • Examples 1 to 5 and Reference Examples 1 to 3 Production of Liquid Crystal Display
  • a prism film having a vertex angle ⁇ of 95 ° and a light diffusing plate were respectively installed in the backlight device of the 32-inch liquid crystal television “Woooo UT32-HV700B” manufactured by HITACHI in the IPS mode.
  • the two prism films arranged in the liquid crystal display device were arranged so that the directions of the ridgelines of the linear prisms were orthogonal. Then, the polarizing plate on the light emitting surface side of the liquid crystal cell is peeled off, and an iodine-based normal polarizing plate “TRW842AP7” manufactured by Sumitomo Chemical Co., Ltd.
  • the transmission axis of the polarizing plate is the short side of the liquid crystal cell. And were bonded so as to be parallel to the long sides.
  • the arrangement of the prism film and the polarizing plate was the same as in FIG.
  • the optical film produced by the said manufacture example was bonded on it, and the liquid crystal display device was produced.
  • Examples 1 to 5 and Reference Examples 1 to 3 Evaluation of front contrast of liquid crystal display device
  • the front contrast of the manufactured liquid crystal display device was measured as follows. In a dark room, a luminance meter BM-5A (manufactured by Topcon Corporation) was used to measure the front luminance in the black display state and white display state of the liquid crystal display device, and the front contrast was calculated. The front contrast of the produced liquid crystal display device was measured. The results are shown in Table 3.
  • Examples 1 to 5 and Reference Example 1 Evaluation of viewing angle of liquid crystal display device
  • the display quality of the liquid crystal display devices of Examples 1 to 5 and Reference Example 1 having excellent front contrast were visually evaluated for display quality at a predetermined viewing angle.
  • the presence or absence of gradation collapse and the presence or absence of inversion were examined. The results are shown in Table 4.
  • A No abnormality is observed in the display quality.
  • ⁇ Slight gradation collapse is observed, but other display quality abnormalities are hardly observed.
  • ⁇ Although gradation collapse is recognized, visual recognition is possible.
  • X Collapsed gradation or inversion is recognized.
  • the liquid crystal display devices of Examples 1 to 5 have a viewing angle of 40 to 60 °, and neither gradation collapse nor inversion is observed, and no abnormality is observed in display quality. In the viewing angle of 50 ° or more, gradation collapse and inversion are recognized, indicating that the surface quality is poor.
  • the viewing angle is an angle corresponding to the emission angle ⁇ on the plane 14b in FIG. Further, scintillation did not occur in the liquid crystal display devices of Examples 1 to 5, but scintillation occurred in the liquid crystal display device of Reference Example 1.
  • Examples 6 to 10 and Reference Example 4 Evaluation of viewing angle of liquid crystal display device
  • Example 1 Example 1 except that a prism film and a light diffusion plate having an apex angle ⁇ of 110 ° were respectively installed instead of the prism film and the light diffusion plate having an apex angle ⁇ of 95 °.
  • a liquid crystal display device was produced in the same manner as in Examples 5 to 5 and Reference Example 1, and visual evaluation of display quality at a predetermined viewing angle was performed. As the display quality, the presence or absence of gradation collapse and the presence or absence of inversion were examined. The results are shown in Table 5.
  • A No abnormality is observed in the display quality.
  • ⁇ Slight gradation collapse is observed, but other display quality abnormalities are hardly observed.
  • ⁇ Although gradation collapse is recognized, visual recognition is possible.
  • X Collapsed gradation or inversion is recognized.
  • the liquid crystal display devices of Examples 6 to 10 have almost no abnormality in display quality.
  • the liquid crystal display device of Reference Example 4 has gradation collapse and inversion at a viewing angle of 50 ° or more. It is recognized that the surface quality is inferior. Further, scintillation did not occur in the liquid crystal display devices of Examples 6 to 10, but scintillation occurred in the liquid crystal display device of Reference Example 4.
  • Examples 11 to 15 and Reference Example 5 Evaluation of viewing angle of liquid crystal display device
  • Example 1 Example 1 except that a prism film having a vertex angle ⁇ of 90 ° and a light diffusing plate were respectively installed instead of the prism film having a vertex angle ⁇ of 95 ° and the light diffusing plate.
  • a liquid crystal display device was produced in the same manner as in Examples 5 to 5 and Reference Example 1, and visual evaluation of display quality at a predetermined viewing angle was performed. As the display quality, the presence or absence of gradation collapse and the presence or absence of inversion were examined. The results are shown in Table 6.
  • A No abnormality is observed in the display quality.
  • ⁇ Slight gradation collapse is observed, but other display quality abnormalities are hardly observed.
  • ⁇ Although gradation collapse is recognized, visual recognition is possible.
  • X Collapsed gradation or inversion is recognized.
  • the liquid crystal display devices of Examples 11 to 15 show almost no abnormality in display quality, but the liquid crystal display device of Reference Example 5 shows gradation collapse and inversion at a viewing angle of 50 ° or more. It can be seen that the display quality is inferior. Further, scintillation did not occur in the liquid crystal display devices of Examples 11 to 15, but scintillation occurred in the liquid crystal display device of Reference Example 5.
  • the liquid crystal display device including the optical film of the present invention is less likely to cause display quality problems at a wide viewing angle, has high front contrast and high clarity of transmitted images, and is less likely to cause scintillation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un film optique qui n'occasionne que rarement des problèmes de qualité d'affichage pour un angle de vision très ouvert, tout en parvenant à une netteté élevée des images transmises sans diminution du contraste frontal. Le film optique peut réduire la fréquence de survenue d'une scintillation. L'invention concerne également un dispositif d'affichage à cristaux liquides comprenant le film optique. Une couche antireflet (72), obtenue par dispersion et mélange de fines particules optiques (722) dans une résine optique (721), est disposée sur un film de support (71). Les fines particules optiques (722) possèdent un diamètre moyen de particule de 0,5 µm ou plus, mais qui est inférieur à 5 µm, et la quantité des fines particules optiques (722) contenues à l'intérieur est supérieure à 35 parts en poids mais inférieure à 60 parts en poids pour 100 parts en poids de la résine optique. L'épaisseur de la couche antireflet (72) est de 1 à 3 fois le diamètre moyen de particule des fines particules optiques (722). Dans cette liaison, l'indice de réfraction des fines particules optiques (722) est de préférence supérieur à l'indice de réfraction de la résine optique (721), et la différence entre l'indice de réfraction des fines particules optiques (722) et l'indice de réfraction de la résine optique (721) est de préférence supérieure à 0,04 mais inférieure à 0,1.
PCT/JP2009/071127 2008-12-23 2009-12-18 Film optique et dispositif d'affichage à cristaux liquides le comprenant WO2010073985A1 (fr)

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US13/141,273 US20110279752A1 (en) 2008-12-23 2009-12-18 Optical film and liquid crystal display device comprising same
CN200980152242XA CN102265193A (zh) 2008-12-23 2009-12-18 光学薄膜以及包括该光学薄膜的液晶显示装置

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KR101934607B1 (ko) * 2011-10-12 2019-01-02 다이니폰 인사츠 가부시키가이샤 화상 표시 장치용 방현 시트
JP5962142B2 (ja) * 2012-03-30 2016-08-03 大日本印刷株式会社 光拡散フィルム、偏光板、及び液晶表示装置
US9618680B2 (en) 2012-04-05 2017-04-11 Corning Incorporated Methods and apparatus for providing display components
KR102053703B1 (ko) * 2014-03-28 2019-12-09 동우 화인켐 주식회사 광확산 방현필름용 조성물 및 이를 이용한 광확산 방현필름
KR102155400B1 (ko) * 2016-02-29 2020-09-11 주식회사 엘지화학 고색재현 필름, 이를 포함하는 편광판 및 상기 편광판을 포함하는 액정 디스플레이 장치
CN108490679A (zh) * 2018-03-28 2018-09-04 京东方科技集团股份有限公司 显示装置及其制造方法
JP7305928B2 (ja) * 2018-07-10 2023-07-11 東洋製罐株式会社 フィルムの立体加工方法
WO2020115837A1 (fr) * 2018-12-05 2020-06-11 凸版印刷株式会社 Substrat de matrice de couleur noire et dispositif d'affichage muni d'un substrat de matrice de couleur noire
EP3894745B1 (fr) * 2018-12-13 2023-07-19 Signify Holding B.V. Dispositif d'éclairage à effet étincelant
CN109902649A (zh) * 2019-03-11 2019-06-18 深圳阜时科技有限公司 生物特征检测模组和背光模组、显示器及电子装置
WO2023189797A1 (fr) * 2022-03-30 2023-10-05 日東電工株式会社 Procédé de fabrication de film polarisant

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TW201030366A (en) 2010-08-16
US20110279752A1 (en) 2011-11-17

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